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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

AMD Phenom II X4 B55 vs Athlon II X4 640

The AMD Athlon II X4 640 is newer than AMD Phenom II X4 B55 and is around -12% slower in multi-threaded (CPU Mark) testing. The AMD Athlon II X4 640 is around -9% slower in single-thread testing. All the CPUs in this comparison belong in the Desktop CPU Class. The values below were tabulated from a combined 2399 benchmarks submitted from our PerformanceTest software and results and are updated daily to include new submissions.

  • The first section will show basic information for each CPU selected.
  • The additional graphs shows the CPU Mark and Single Thread values of each CPU selected.
  • An accompany graph, if price data is available, will shows the value for money, in terms of the CPU Mark/Thread Rating per dollar.
  • The last section will show approximate yearly running costs for the CPUs.

×AMD Phenom II X4 B55×AMD Athlon II X4 640+ ADD
Price Search Online Search Online
Socket TypeAM2+/AM3AM3
CPU ClassDesktopDesktop
Clockspeed3.3 GHz3.0 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
CacheL1: 512KB, L2: 2.0MB, L3: 6MBL1: 512KB, L2: 2.0MB, L3: 6MB
TDPNA295W
Yearly Running CostNA$17.34
Other
First Seen on ChartQ1 2010Q2 2010
# of Samples5521847
CPU Rank32353440
CPU Value0.033.5
Single Thread Rating(% diff. to max in group)1330(0.0%)1213(-8.8%)
CPU Mark(% diff. to max in group)2594(0.0%)2277(-12.2%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.
2 - Information not available. Do you know? Notify Us.

CPU Mark Rating
As of 5th of March 2026 - Higher results represent better performance
AMD Phenom II X4 B55
2,594
AMD Athlon II X4 640
2,277
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 5th of March 2026 - Higher results represent better value
AMD Phenom II X4 B55
NA
AMD Athlon II X4 640
33.5
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 5th of March 2026 - Higher results represent better performance
AMD Phenom II X4 B55
1,330
AMD Athlon II X4 640
1,213
PassMark Software © 2008-2026
Estimated Energy Usage Cost
Estimated Energy Adjustable Values
Average hours of use per day Average CPU Utilization (0-100%)1 Power cost, $ per kWh2
8
25
1Average user usage is typically low and can vary from task to task. An estimate load 25% is nominal.
2Typical power costs vary around the world. Check your last power bill for details. Values of $0.15 to $0.45 per kWh are typical.
AMD Phenom II X4 B55 AMD Athlon II X4 640
Max TDPNA95W
Power consumption per day (kWh)NANA
Running cost per dayNANA
Power consumption per year (kWh)NANA
Running cost per yearNANA
Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.